WO2003106833A1

WO2003106833A1 - Adsorbent of latent-heat storage type for canister and process for producing the same

Info

Publication number: WO2003106833A1
Application number: PCT/JP2003/007177
Authority: WO
Inventors: 建司関
Original assignee: 大阪瓦斯株式会社
Priority date: 2002-06-18
Filing date: 2003-06-06
Publication date: 2003-12-24
Also published as: JP2010179303A; CN1662738A; EP1536128A1; EP1536128B1; EP1536128A4; CA2489318C; JPWO2003106833A1; JP4508867B2; CA2489318A1; US7906078B2; CN1662738B; US20050247202A1

Abstract

An adsorbent of the latent-heat storage type for canisters which can be effectively inhibited from changing in temperature due to the heat of absorption/desorption and has a high butane working capacity; a process for producing the adsorbent; and a canister employing the adsorbent of the latent-heat storage type for canisters. The adsorbent of the latent-heat storage type for canisters comprises: an adsorbent adsorbing a fuel vapor; and a heat-storage material comprising a microencapsulated phase-changing substance which absorbs or releases latent heat depending on temperatures.

Description

TECHNICAL FIELD The present invention relates to a so-called canister for preventing fuel evaporation of a vehicle and an adsorbent thereof. Landscape technology

In general, in vehicles, due to pollution control measures, the fuel vapor generated in the fuel tank and the fuel storage chamber such as the float chamber of the carburetor during the stop and running of the vehicle is guided to the carbon carrier, and the activated carbon as the adsorbent is used. When the vehicle is running, the air is taken into the canister, the P and the desorbed fuel are desorbed, and sent to the engine intake pipe through the control valve.

In general, the adsorption capacity of activated carbon for evaporative fuel increases as the activated carbon temperature decreases, while the desorption performance increases as the activated carbon temperature increases. However, the phenomenon in which the evaporated fuel is adsorbed on the activated carbon is an exothermic reaction, and the activated carbon temperature rises as the evaporated fuel is adsorbed, and the adsorbing ability of the activated carbon decreases. On the other hand, the phenomenon in which the evaporative fuel desorbs from the activated carbon is an endothermic reaction, and the desorption performance of the activated carbon deteriorates because the temperature of the activated carbon decreases with the desorption of the evaporative fuel.

Therefore, as a varnish that can solve such a problem, a type in which granular material having a higher specific heat than the activated carbon is mixed into the activated carbon has been proposed. In this varnish, the heat generated due to the adsorption of the evaporative fuel by the activated carbon was consumed to raise the temperature of the material having a large specific heat, thereby suppressing the increase in the temperature of the activated carbon. By supplying the heat necessary for desorption of the activated carbon from the material having a large specific heat, the temperature drop of the activated carbon is suppressed, thereby improving the P and ^ -desorption characteristics.

However, such a material having a large specific heat is made of a metal material, ceramic, or the like. However, these specific heats are small as compared with P and the heat of desorption, and a sufficient effect can be obtained. 07177

Two

If so, a large amount of material must be mixed. Since these materials themselves have almost no adsorption performance, there is a problem that even if the temperature is improved, the adsorption performance as a total is not significantly improved. Disclosure of the invention

In view of the above problems, the present invention can effectively suppress a temperature change due to P and heat of desorption, and has a large heat storage type P for canisters having a large butane-king capacity and a method for producing the same. And a canister using the latent heat storage type adsorbent for canister.

As a result of intensive studies, the inventor of the present invention has a powder heat storage material in which microcapsules are filled with an adsorbent that adsorbs evaporated fuel and a phase change material that absorbs and releases latent heat according to the temperature. It has been found that the above object is achieved by using an adsorbent as an adsorbent for canisters, and the present invention has been completed.

That is, the present invention provides the following latent heat storage type adsorbent for canisters, a method for producing the adsorbent, and a canister for preventing fuel evaporation.

Item 1. A latent heat storage adsorbent for canisters, comprising an adsorbent that adsorbs vaporized fuel and a heat storage material in which a phase change material that generates and releases latent heat according to temperature is enclosed in a microphone opening capsule.

Item 2. The latent heat storage adsorbent for Canis Yuichi according to Item 1, wherein the adsorbent is activated carbon, activated alumina or a mixture thereof.

Item 3. The latent heat storage adsorbent for canisters according to Item 1 or 2, wherein the average particle size of the heat storage material is about 1/10000 to 110 of the average particle size of the adsorbent.

Item 4. The latent heat storage adsorbent for canisters according to Item 1, 2 or 3, wherein the average particle size of the adsorbent is about 1 m to 10 mm.

Item 5. The latent heat storage adsorbent for canisters according to any one of Items 1 to 4, wherein the average particle diameter of the heat storage material is about 0.1 to 500 m.

Item 6. The latent heat storage adsorbent for canisters according to any one of Items 1 to 5, wherein the heat storage material is attached and / or attached to the surface of the P and the bonding material.

Item 7. Latent heat storage adsorbent and binder according to any one of Items 1 to 6 Latent heat storage type adsorbent for canister Yuichi, which is a molded product consisting of a die.

Item 8. The latent heat storage type adsorbent for varnish of item 7, wherein the shape of the molded article is at least one shape selected from the group consisting of a pellet, a disk, and a block.

Item 9. The method according to any one of Items 1 to 6, wherein the heat storage material is adsorbed and Z or impregnated on the particle surface of the adsorbent.

Item 10. The method according to any one of Items 1 to 6, wherein the heat storage material is electrostatically adsorbed and / or attached to the particle surface of the adsorbent.

Item 11. The method according to any one of Items 1 to 6, wherein the heat storage material and the adsorbent are uniformly mixed.

Item 1 2. The method according to any one of Items 1 to 6, wherein a slurry in which the heat storage material is suspended in the liquid medium and the adsorbent are mixed and dried.

Item 13: A slurry in which a heat storage material, in which a phase change substance that absorbs and releases latent heat according to temperature in a microcapsule is encapsulated in microcapsules, is suspended in a liquid medium on the surface of the adsorbent that adsorbs evaporated fuel, A method for producing a latent heat storage type adsorbent for canisters, comprising spraying a mixed liquid containing a binder according to the conditions.

Item 1 4. It is characterized by uniformly mixing the adsorbent that adsorbs the vaporized fuel and the heat storage material compact in which microcapsules contain a phase change substance that absorbs and releases latent heat depending on the temperature. A method of manufacturing a latent heat storage type adsorbent for Canis Yuichi.

Item 15. An adsorbent that adsorbs vaporized fuel, a phase-change substance that causes the absorption and release of latent heat depending on the temperature, a powdered heat storage material encapsulated in microcapsules, or the heat storage material is suspended in a liquid medium. A method for producing a latent heat storage type adsorbent for canisters, characterized by uniformly mixing and forming a slurry, binder and water.

Item 16 6. A latent heat storage adsorbent for varnish obtained by the production method according to any one of Items 13 to 15.

Item 17. A canister containing the latent heat storage type adsorbent according to any one of Items 1 to 8 and 16-a canister for preventing fuel vaporization filled in a container. DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail.

Latent heat storage adsorbent for Yuichi Canis

The latent heat storage type adsorbent for canisters of the present invention involves an adsorbent that adsorbs vaporized fuel (hereinafter, also simply referred to as “adsorbent”) and a phase change that causes absorption and release of latent heat in accordance with temperature. It is obtained by mixing a substance (hereinafter referred to as “phase change substance”) with a powdered heat storage material encapsulated in microcapsules. That is, the latent heat storage type adsorbent for canisters of the present invention is characterized in that a heat storage material containing a phase change substance is used as a heat control material of the adsorbent for canisters.

Examples of the vaporized fuel to which the latent heat storage type adsorbent for varnish of the present invention is applied include, for example, gasoline for automobiles and the like.

The adsorbent for adsorbing the vaporized fuel used in the present invention may be any generally used adsorbent for canis, such as activated carbon, activated alumina, silica gel, zeolite, organometallic complex, silica porous material. And the like, or a mixture thereof. Preferably, activated carbon, activated alumina, or a mixture thereof can be used. Activated carbon is particularly preferred. Activated carbon can be obtained from various raw materials such as coal, coconut husk, wood, and lignin. 7K steam activated products; carbon dioxide activated products; chemicals using phosphoric acid, zinc chloride, metal alloys, etc. Activated carbon activated products such as activated products can be used. The P and binder applied to the present invention is preferably in the form of particles or powder having pores in order to increase the ability to adsorb the evaporated fuel. The average particle size of the adsorbent may be, for example, about lm to 10 mm. The specific surface area is usually about 500 to 2500 m ² Z g, preferably about 800 to 230 m ² Z g. The pore diameter may be about 10 to 5 OA, preferably about 10 to 35 A.

The heat storage material used in the present invention comprises powder microcapsules enclosing a phase change substance.

The phase change substance encapsulated in the heat storage material is not particularly limited as long as it is a compound capable of absorbing and releasing latent heat with the phase change. Examples of the phase change include a phase change between a solid and a liquid. The temperature (eg, melting point, freezing point, etc.) at which the phase change substance can cause a phase change can be appropriately selected according to the use of the canister, but is usually about 0 to 50 ° C. Preferred compounds include, for example, Toradekan, pen evening hexadecane decane, to, heptene evening decane, Okutadekan, nona decane, eicosane, fat脑炭hydrogen linear, such as docosane, natural wax; petroleum _{_{waxes; LiN0 3 '3¾0, Na 2}} S0 4' 10 0, Hydrates of inorganic compounds such as Na ₂ HP0 ₄ '12¾0; fatty acids such as phosphinic acid and lauric acid; higher alcohols having 12 to 15 carbon atoms; ester compounds such as methyl palmitate and methyl stearate Is mentioned. As the phase change substance, two or more compounds selected from the above may be used in combination to adjust the melting point. When two or more phase change materials are used in combination, a combination in which the phase difference between the phase change materials causes a temperature difference of about 0 to 15 ° C. is preferable.

Further, in order to prevent a supercooling phenomenon of the phase change material, a compound having a melting point higher than the melting point of the phase change material may be added as necessary. Specific examples of the high melting point compound include an aliphatic hydrocarbon compound, an aromatic compound, an ester, a carboxylic acid, an alcohol, and an amide. The high melting point compound may be used alone or in combination of two or more. For example, a mixture such as castor oil may be used.

Examples of the aromatic compound include halogen-substituted benzene and naphthalene. Examples of the halogen-substituted benzene include dihalogenated benzene such as dibromobenzene and dichlorobenzene.

Examples of the esters include fatty acid esters of monoalcohols such as methyl eicosanoic acid; and fatty acid esters of glycerin such as linoleic acid glyceride. Examples of the carboxylic acids include aliphatic carboxylic acids such as myristic acid, penicillic acid, palmitic acid, malgaric acid, stearic acid, nonadecyl acid, eicosanoic acid, henycosanoic acid, and behenic acid; and aromatic carboxylic acids such as benzoic acid. Acids and the like can be exemplified. Examples of alcohols include monoalcohols such as cetyl alcohol, heptadecanol, stearyl alcohol, nonadenicol, and eicosanol. Examples of the amides include fatty acid amides such as eicosanoic acid amide, nonadecyl acid amide, stearic acid amide, and oleic acid amide.

The concentration of the high melting point compound is usually about 0.5 wt% to 30 wt% relative to the phase change substance, and preferably about l wt% to 15 wt%.

As the material of the microcapsules, known materials can be used, and for example, a polymer compound such as a resin can be exemplified. Formaldehyde is a high molecular compound —Examples include melamine resin, melamine resin, formaldehyde-urea resin, urea resin, urea-formaldehyde-polyacrylic acid copolymer, polystyrene, polyvinyl acetate, polyacrylonitrile, polyethylene, polybutyl methacrylate, and gelatin.

The weight ratio of the material of the microcapsules to the phase change substance is not particularly limited, but may be generally about 30:70 to about L0: 90. When the high melting point compound and the phase change substance are used in combination, the total amount of the high melting point compound and the phase change substance can be set so as to be within the above range with respect to the weight of the material of the microcapsule.

As a method of microencapsulating the phase change substance used in the present invention, known methods such as a coacervation method, an interfacial polymerization method, an in situ method, and a method using yeast can be used. In any case, the effects of the present invention can be achieved.

For example, a phase change substance (and a high melting point compound, if necessary) is emulsified in a liquid medium using an emulsifier or the like, and an initial condensate (pre-polymer) corresponding to a desired content is added thereto, and then the mixture is heated. By heating and conducting the polymerization reaction, it is possible to prepare a microcapsule dispersion (slurry) having a resin wall and containing a phase-change substance (and, if necessary, a high-melting-point compound).

As the liquid medium, water is particularly preferred, but alcohols such as methanol, ethanol, and propanol, and water-miscible solvents such as acetone can be used. The above solvents may be used as a mixture.

The shape of the microcapsules is usually spherical particles, and the control of the particle size of the particles depends on the type and concentration of the emulsifier at the time of encapsulation, the temperature and time at the time of emulsification, the emulsification method, etc. Since it fluctuates depending on factors, optimal conditions are set by experiments. The average particle size of the microcapsules should be about 1/100 to about L / 10 with respect to the average particle size of the adsorbent in consideration of the contact area with the adhering material. . Specifically, it is sufficient that the distance is about 0.5 to about 500 m, and preferably about 0.5 to 500 m.

In the latent heat storage type adsorbent for varnish of the present invention, the heat storage material in which the phase change substance is encapsulated in microcapsules and the adsorbent are mixed until uniform, and stored on the surface of the adsorbent particles. It is a mixture to which a heating material adheres.

Manufacturing method of latent heat storage type adsorbent for canis

The latent heat storage type adsorbent for varnish of the present invention can be produced, for example, as follows. The microcapsule dispersion (slurry) containing the phase change substance obtained by the above-described method and the like and the adsorbent are mixed until uniform, and the mixture is dried to obtain a powdery target substance. Alternatively, the powdered microcapsules (heat storage material) obtained by drying the microcapsule dispersion liquid (slurry) and the adsorbent may be mixed until uniform to obtain a powdery target substance. Examples of the mixing method include a method in which a heat storage material (or slurry) and an adsorbent are placed in a predetermined container or bag and shaken, a method using a stirrer such as a mixer or a kneader, or a rotary mixer. A known method such as a method used can be selected. A known method can be used for the drying method.

In the latent heat storage type adsorbent for canisters of the present invention, a heat storage material having a smaller particle diameter than the adsorbent is attached to the surface of the adsorbent particles, and the heat storage material and the adsorbent are in contact with each other. High thermal efficiency is preferable. For example, by controlling the average particle diameters of the heat storage material and the adsorbent as described above, even if the heat storage material and the adsorbent are simply mixed uniformly, the heat storage material can be applied to the particle surface of the adsorbent. Since it adheres electrostatically and Z or adheres, the packing density increases and the heat transfer efficiency increases. In addition, since the classification (separation) of the heat storage material and the adsorbent is suppressed, the temperature change during adsorption and desorption can be suppressed for a long period of time. Furthermore, the latent heat storage type adsorbent for canisters of the present invention can be formed into a powdered latent heat storage type adsorbent in order to suppress scattering of the adsorbent from the canister into the engine. The molding is performed by a known method such as mixing a powdery heat storage material and an adsorbent and compression molding. Further, if necessary, it may be molded by mixing with a solder. For example, a molded article can be obtained by uniformly mixing the heat storage material, the adsorbent, and the binder in the liquid medium, adsorbing and / or adhering the heat storage material to the surface of the adsorbent, and molding. As the binder to be used, commonly used binders such as cellulose such as methylcellulose and carboxymethylcellulose; phenolic resins; polyvinyl alcohol; and vinyl acetate can be used without limitation. Examples of the shape of the molded body include a pellet, a disk, and a block. As another production method other than the above, for example, a microcapsule dispersion liquid containing a phase change material (the above-described heat storage material is suspended in a liquid medium) is placed on the surface of an adsorbent in the form of pellets or crushed powder. The latent heat storage type adsorbent of the present invention, in which microcapsules are coated on the surfaces of P and the adhering material, is sprayed and dried by spraying a solution containing a turbid slurry and, if necessary, a binder. Can be. As the binder to be used, known materials such as cellulose such as methylcellulose and carboxymethylcellulose; phenol resin; polyvinyl alcohol; and vinyl acetate can be used. Known mixing methods, spraying methods, and drying methods can be employed. Alternatively, the adsorbent in the form of pellets or crushed powder and the microcapsules (heat storage material) formed in a uniform shape such as cylindrical pellets, spherical pellets, sheets or the like are uniformly mixed. The latent heat storage type adsorbent of the invention can be obtained. A known method can be used for molding the microcapsules (heat storage material), and a binder may be used as necessary at the time of molding. As the binder to be used, the above-mentioned known binders can be employed.

Alternatively, a powdered adsorbent, a powdered heat storage material or a micro force cell dispersion liquid containing a phase change material (the above-mentioned slurry in which the heat storage material is suspended in a liquid medium), a binder and water are uniformly mixed. Then, the latent heat storage type adsorbent of the present invention can be obtained. As the binder to be used, the above-mentioned known ones can be employed, and the known molding method can be employed.

In the latent heat storage type adsorbent of the present invention, the ratio between the heat storage material and the adsorbent can be appropriately determined by those skilled in the art based on the performance of both. The mixing amount of the heat storage material may be about 10 to about 100 parts by weight of L to 100 parts by weight of the adsorbent. If necessary, the binder may be used in an amount of about 1 to about 0 parts by weight based on 100 parts by weight of the adsorbent.

The adsorbent of the present invention can be adsorbed by filling a canister container and introducing vaporized fuel gas from a fuel tank into the container. The temperature of the gas or vessel is preferably below the phase change temperature (usually the melting point) of the phase change material. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to Examples. The present invention is not limited to the embodiments.

Example 1

To 5 g of the melamine powder, 6.5 g of a 37% aqueous formaldehyde solution and 10 g of water were added to adjust the pH to 8, and the mixture was heated to about 70 ° C to obtain an aqueous solution of an initial condensate of melamine monoformaldehyde. In 100 g of an aqueous solution of a sodium salt of a styrene anhydride copolymer adjusted to pH 4.5, 70 g of n-butadecane was dissolved as a compound accompanied by phase change and the solution was vigorously stirred in the above aqueous solution. The mixture was added and emulsified until the particle size became about 10 m. The whole amount of the melamine-formaldehyde initial condensation aqueous solution was added to the above emulsion, and the mixture was stirred at 70 ° C for 2 hours, and then adjusted to pH 9 and encapsulated. After the completion of the reaction, the capsule was suction-filtered and dried to obtain a capsule having a particle size of about 15 m. This capsule and the crushed activated carbon having a particle size of 0.2 mm to 3 mm are uniformly mixed so that the mixing ratio of the capsule to the activated carbon is 15 wt%, and the mixture is dried to obtain the desired microcapsules. A heat storage adsorbent was obtained, in which was dispersed on the surface of activated carbon. The activated carbon used is a crushed coal-based activated carbon having a specific surface area of 1250 m ² / g, a pore volume of 0.7 lml / g, and an average pore diameter of 12A, of 0.50 mm to 2.36 mm.

Example 2

The butane working capacity of the adsorbent produced in Example 1 was measured by the following method. The above regenerative adsorbent was filled into a 1-liter metal canister, and 99% of 11-butane was adsorbed by downflow at 11 ^ 1111n at 25, and the butane concentration at the outlet reached 5,000 ppm. When stopped. Next, at room temperature, air is flowed at 15 L / min for 20 minutes in an upflow in the evening of the varnish to desorb n-butane. This adsorption / desorption was repeated, and the butane working capacity was determined from the average value of the adsorption amounts and desorption values of the fourth, fifth, and sixth times. As a result, the butane working capacity was 46.7 gZL for a 1 L canister container.

Comparative Example 1

Measurement of butane working capacity of activated carbon only was performed in the same manner as in Example 2. As a result, the amount was 41.6 g / L for a 1 L canister container. As is evident from the above results, the mixing of heat storage material improves butane-capacity.

A heat storage adsorbent was obtained in the same manner using eicosane in place of n-octane decane, which was used as a compound having a phase change in Example 1. Example using it

When the butane peaking capacity was measured by the same method as in 2, the comparative example

Improved from 1.

Also, in Example 1, a heat storage adsorbent was obtained using caprylic acid instead of n-year-old kutadecane, and butane per king capacity was measured using the same in the same manner as in Example 2. Improved than example 1.

Also, in Example 1, a heat storage adsorbent was obtained using methyl palmitate instead of n-year-old kutadecane, and the butane peaking capacity was measured by the same method as in Example 2 to obtain a comparative example. Improved from 1.

Example 3

To 5 g of the melamine powder, 6.5 g of a 37% aqueous solution of formaldehyde and 10 g of water were added, and the pH was adjusted to 8, followed by heating to about 70 ° C to obtain an aqueous solution of an initial melamine monoformaldehyde condensate. In 100 g of an aqueous sodium salt solution of a styrene anhydride copolymer adjusted to pH 4.5, 70 g of n-octadecane as a compound with a phase change and castor oil as a supercooling inhibitor 1. The solution in which 4 g was dissolved was added to the above aqueous solution with vigorous stirring, and emulsification was performed until the particle size became about 10 m. The whole amount of the melamine-formaldehyde initial condensation aqueous solution was added to the above emulsion, and the mixture was stirred at 70 ° C. for 2 hours, and then adjusted to pH 9 for encapsulation. After completion of the reaction, the capsule was subjected to suction filtration and dried to obtain a capsule having a particle size of about 15 m. 25 parts by weight of the capsules and 5 parts by weight of a binder (Ripoxyl methylcellulose) are dispersed in a small amount of water, and 100 parts by weight of crushed activated carbon having a particle size of 1 to 3 mm is added to the dispersion. The mixture was uniformly mixed and further dried at 90 to obtain a heat storage type adsorbent in which a microphone opening capsule as an object was attached to the surface of activated carbon. The activated carbon used was 1 mm to 3 mm crushed activated carbon with a specific surface area of 1500 m ² Zg, a pore volume of 0.96 ml / g, and an average pore diameter of about 13 A. Example 4

With respect to the adsorbent produced in Example 3, butane king capacity was measured by the following method. The above regenerative adsorbent was charged into a 1 L metal canister, and at 25 ° C, 9.9% n-butane was adsorbed at 1 L / min downflow, and the butane concentration at the outlet was 50%. Stop when 0 0 p pm is reached. Next, at room temperature, air is flowed up at a flow rate of 15 L / min for 20 minutes in the evening of the varnish to desorb n-butane. This adsorption / desorption was repeated, and the butane peaking capacity was determined from the average value of the adsorption amounts and desorption values of the fourth, fifth and sixth times. As a result, the butane working capacity was 62.5 g / L for a 1 L canister. The temperature at the time of adsorption was 57 at the center of the container, and the temperature at the time of desorption was 18 ° C at the center of the container. Further, the heel amount (the amount of butane remaining in the pores after desorption) at the sixth time was 30.8 g / L. Comparative Example 2

When the butane working capacity of only the activated carbon of Example 3 was measured in the same manner as in Example 4, it was 56.3 gZL for a 1 L canister. The temperature during adsorption is 73 at the center of the container, and the temperature at desorption is 14 at the center of the container. C.

Further, the heel amount (the amount of butane remaining in the pores after desorption) at the sixth time was 48. 2 gZL. As is clear from the above results, by mixing the heat storage material containing the phase change material, the butane working capacity was improved, the temperature rise rate during adsorption was improved, and the desorption performance was improved (the heel amount was reduced). Reduction), it is possible to reduce the amount of emission of vaporized gas (emission amount). Effects of the present invention

By using the latent heat storage type adsorbent for canisters of the present invention in a canister, when the vaporized fuel is adsorbed on the adsorbent, the generated heat of adsorption is transferred to the heat storage material containing the phase change substance and stored as latent heat. The rate of temperature rise of the adsorbent decreases, and as a result The adsorption performance of the evaporated fuel is greatly improved. In addition, when the vaporized fuel is desorbed, the heat stored in the heat storage material is transferred to the adsorbent to suppress a decrease in the temperature of the adsorbent, thereby further improving the desorption performance of the vaporized fuel. As a result, the latent heat storage type adsorbent for canisters of the present invention has remarkably improved adsorption-desorption performance of vaporized fuel as compared with conventional adsorbents for canisters and canisters mixed with substances having a high specific heat. I do.

In addition, since the rise in temperature due to the heat generated during adsorption of the canister is suppressed, it is possible to use an inexpensive material having a lower heat-resistant temperature for the canister container. Can supply.

Claims

The scope of the claims

1. A latent heat storage type adsorbent for canisters that includes an adsorbent that adsorbs vaporized fuel and a heat storage material that encapsulates a phase change material that absorbs and releases latent heat according to temperature in microcapsules.

2. The latent heat storage type adsorbent for canisters according to claim 1, wherein the adsorbent is activated carbon, activated alumina or a mixture thereof.

3. The latent heat storage type adsorbent for canisters according to claim 1 or 2, wherein the average particle size of the heat storage material is about 1/1000 to 1/10 of the average particle size of the adsorbent. .

4. The average particle size of the material is 1π! The latent heat storage adsorbent for canisters according to claim 1, 2 or 3, wherein the adsorbent is about 10 mm or less.

5. The latent heat storage adsorbent for canisters according to any one of claims 1 to 4, wherein the heat storage material has an average particle size of about 0.1 to 500 m.

6. The latent heat storage adsorbent for a canister according to any one of claims 1 to 5, wherein a heat storage material is attached and / or attached to the surface of the material.

7. A latent heat storage type adsorbent for a canister, which is a molded article comprising the binder and the binder according to any one of claims 1 to 6.

8. The latent heat storage adsorbent for canisters according to claim 7, wherein the shape of the molded body is at least one shape selected from the group consisting of a pellet, a disk, and a block. C

9. The method according to any one of claims 1 to 6, wherein the heat storage material is adsorbed and Z or attached to the particle surface of the adsorbent.

10. The method according to any one of claims 1 to 6, wherein the heat storage material is electrostatically adsorbed and / or attached to the particle surface of the adsorbent.

11. The method according to any one of claims 1 to 6, wherein the heat storage material and the adsorbent are uniformly mixed.

1 2. The production method according to any one of claims 1 to 6, wherein a slurry in which a heat storage material is suspended in a liquid medium and an adsorbent are mixed and dried.

1 3. Absorption and release of latent heat according to temperature on the surface of the adsorbent that absorbs evaporated fuel Latent heat storage adsorbent for canisters, characterized by spraying a slurry containing a phase change substance that causes phase change in a liquid crystal » Manufacturing method.

1 4. Uniform mixing of adsorbent for adsorbing vaporized fuel and heat storage material molded into microcapsules containing a phase change substance that absorbs and releases latent heat depending on temperature A method for producing a latent heat storage type adsorbent for canisters.

1 5. An adsorbent that adsorbs vaporized fuel, a phase change substance that absorbs and releases latent heat depending on temperature A powdered heat storage material in which a microphone opening capsule is enclosed, or the heat storage material is suspended in a liquid medium A method for producing a latent heat storage type adsorbent for use on a canister, characterized by uniformly mixing and forming a slurry, a binder and water.

16. A latent heat storage adsorbent for canisters obtained by the production method according to any one of claims 13 to 15.

17. A canister for preventing fuel evaporation, wherein the latent heat storage adsorbent according to any one of claims 1 to 8 and 16 is filled in a canister container.